CN103474700B - A kind of rectangular lithium ion battery self discharge screening technique - Google Patents
A kind of rectangular lithium ion battery self discharge screening technique Download PDFInfo
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- CN103474700B CN103474700B CN201310321003.0A CN201310321003A CN103474700B CN 103474700 B CN103474700 B CN 103474700B CN 201310321003 A CN201310321003 A CN 201310321003A CN 103474700 B CN103474700 B CN 103474700B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
A kind of rectangular lithium ion battery self discharge screening technique, comprises the following steps: (1) charges to battery default state-of-charge in normal temperature and pressure environment, records battery open circuit voltage V1; (2) battery is placed in to preset high-pressure environment, shelves preset time t; (3) battery is taken out and is placed in atmospheric pressure environment, record battery open circuit voltage V2; (4) V2 value being less than to setting value U1 or V1 and V2 difference is greater than the battery that sets value U2 and goes out as the large battery screening of self discharge. As preferably, in above-mentioned steps (1), default state-of-charge is 50%～100%SOC; In above-mentioned steps (2), preset high-pressure environment is 0.15MPa～1MPa; Shelving preset time t is 5～20 days. The present invention applies default high pressure by square shaped battery makes battery positive/negative plate fully contact with barrier film the battery that Effective selection self discharge is large, can greatly improve the recall rate of the large battery of self discharge, improves the quality of products.
Description
Technical field
The present invention relates to a kind of rectangular lithium ion battery self discharge screening technique.
Background technology
At present, increasingly exhausted along with fossil fuel, the going from bad to worse of environment, lithium ion battery is as new powerSource, becomes the core component of electric automobile, fast development. Battery for electric automobile group is mainly through joining by a large amount of cellsSeries and parallel composition after group. The uniformity of cell is the key factor that affects battery performance performance. Cell self dischargeThe inconsistent of rate is to cause one of poor major reason of battery performance. Therefore, need to be by self discharge before cell dispatches from the factoryLarge battery screening out.
Self-discharge of battery refers to that battery is in the time of open-circuit condition, because inner spontaneous reaction causes the loss of capacity, conventionally usesOpen-circuit voltage or open-circuit voltage fall and intuitively reflect self-discharge of battery size. Self discharge is the inevitable phenomenon of battery. CauseThe factor of self-discharge of battery is a lot, and wherein the particle in processing procedure process, metal fillings, burr etc. pierce through barrier film and make positive and negative atomic shortRoad is the main cause that causes self-discharge of battery large. But, only have in the time of battery positive/negative plate and barrier film close contact this classMicro-short circuit just easily occurs, and self-discharge of battery great talent can show obviously. When battery positive/negative plate contacts closely with barrier film,Grain, metal fillings, burr etc. may not can pierce through barrier film and form both positive and negative polarity micro-short circuit, also just can not cause large the asking of self-discharge of batteryTopic.
Rectangular cell is due to the size characteristics of itself, and it is not generally very tight between inner positive/negative plate and barrier film, contactingClose. Especially duricrust rectangular cell, inside battery pole piece to enter shell lower than relative cylindrical battery, inner pole piece both positive and negative polarity with everyBetween film, contact is comparatively lax. Under atmospheric pressure environment, battery external and internal pressure equates, inside battery pole piece structural relaxation, micro-short circuitMay not can occur, thereby can not cause self-discharge of battery large, but may be under certain specified conditions, micro-short circuit can occur, and leadsCause self-discharge of battery large.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of rectangular lithium ion battery self discharge screening technique.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of rectangular lithium ion battery self dischargeScreening technique, comprises the following steps:
(1) battery is charged in normal temperature and pressure environment to default state-of-charge, record battery open circuit voltage V1;
(2) battery is placed in to preset high-pressure environment, shelves preset time t;
(3) battery is taken out and is placed in atmospheric pressure environment, record battery open circuit voltage V2;
(4) V2 value is less than to setting value U1 or V1 and V2 difference and is greater than the battery that sets value U2 as the large battery sieve of self dischargeSelect.
As preferably, in step (1), default state-of-charge is 50%～100%SOC.
Another preferably, preset high-pressure environment is 0.15MPa～1MPa in step (2).
Also have one preferably, in step (2), shelving preset time t is 5～20 days.
The invention has the beneficial effects as follows:
Applying default high pressure by square shaped battery makes battery positive/negative plate fully contact Effective selection with barrier filmThe battery that self discharge is large, can improve the recall rate of the large battery of self discharge greatly, improves the quality of products.
Detailed description of the invention
Embodiment 1:
Get 1000 12Ah phosphate Fe, lithium and aluminum shell rectangular cells, it is 100%SOC that charging causes battery charge state, record electricityCell voltage V1. Then, battery is placed in to normal temperature 0.3MPa environment and leaves standstill 15 days. Take out after battery, in normal temperature and pressure environmentThe open-circuit voltage V2 of test battery, judges that V2 is large lower than the self-discharge of battery of 3.338V. As shown in table 1, have 4 cell voltagesLower than 3.338V, as the large battery of self discharge screened go out.
Comparative example 1:
By 1000 12Ah phosphate Fe, lithium and aluminum shell rectangular cells in embodiment 1, it is 100% that charging causes battery charge stateSOC, records cell voltage V1. Then, battery is placed in to normal temperature and pressure environment and shelves 15 days, take out after battery, normal at normal temperatureThe open-circuit voltage V2 of test battery in pressure ring border, judges that V2 is large lower than the self-discharge of battery of 3.338V. As shown in table 1, only find 1Cell voltage is lower than 3.338V, as the large battery of self discharge screened go out.
Embodiment 2:
Get 1000 12Ah phosphate Fe, lithium and aluminum shell rectangular cells, it is 50%SOC that charging causes battery charge state, records batteryVoltage V1. Then, battery is placed in to normal temperature 0.7MPa environment and leaves standstill 10 days. Take out after battery, in normal temperature and pressure environment, surveyThe open-circuit voltage V2 of examination battery, the self-discharge of battery that the difference that judges V1-V2 is greater than 20mV is large. As shown in table 1, have 5 electricityThe pressure reduction in pond is greater than 20mV, as the large battery of self discharge screened go out.
Comparative example 2:
By 1000 12Ah phosphate Fe, lithium and aluminum shell rectangular cells in embodiment 2, it is 50% that charging causes battery charge stateSOC, records cell voltage V1. Then, battery is placed in to normal temperature and pressure environment and leaves standstill 10 days. Take out after battery, normal at normal temperatureThe open-circuit voltage V2 of test battery in pressure ring border, the self-discharge of battery that the difference that judges V1-V2 is greater than 20mV is large. It is as shown in table 1,Only have the pressure reduction of 1 battery to be greater than 20mV, as the large battery of self discharge screened go out.
Can find out from the experimental data of table 1, by existing the large battery of potential micro-short circuit self discharge to apply defaultTemperature, pressure fully contacts battery positive/negative plate and barrier film can the large battery of Effective selection self discharge. The present embodiment can be largeThe large recall rate that improves the large battery of self discharge, improves the quality of products.
Table 1
| Embodiment | Embodiment 1 | Comparative example 1 | Embodiment 2 | Comparative example 2 |
| Experiment battery core quantity/only | 1000 | 1000 | 1000 | 1000 |
| State-of-charge (SOC) | 100％ | 100％ | 50％ | 50％ |
| Shelve environmental pressure | 0.3MPa | Normal pressure | 0.7MPa | Normal pressure |
| The time of shelving/sky | 15 | 15 | 10 | 10 |
| The large battery of self discharge sifts out | 4 | 1 | 5 | 1 |
| Quantity/only |
Above-described embodiment of the present invention, does not form limiting the scope of the present invention. Any in the present inventionSpirit and principle within do amendment, be equal to and replace and improvement etc., all should be included in claim protection model of the present inventionWithin enclosing.
Claims (2)
1. a rectangular lithium ion battery self discharge screening technique, is characterized in that comprising the following steps:
(1) battery is charged in normal temperature and pressure environment to default state-of-charge, record battery open circuit voltage V1; Described default lotusElectricity condition is 50%SOC;
(2) battery is placed in to preset high-pressure environment, shelves preset time t; Described preset high-pressure environment be 0.15MPa～1Mpa；
(3) battery is taken out and is placed in atmospheric pressure environment, record battery open circuit voltage V2;
(4) V2 value is less than to setting value U1 or V1 and V2 difference and is greater than the battery that sets value U2 as the large battery screening of self dischargeGo out.
2. rectangular lithium ion battery self discharge screening technique according to claim 1, is characterized in that, institute in step (2)Stating and shelving preset time t is 5～20 days.
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| CN201310321003.0A CN103474700B (en) | 2013-07-26 | 2013-07-26 | A kind of rectangular lithium ion battery self discharge screening technique |
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| CN201310321003.0A CN103474700B (en) | 2013-07-26 | 2013-07-26 | A kind of rectangular lithium ion battery self discharge screening technique |
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Families Citing this family (17)
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|---|---|---|---|---|
| CN104190639A (en) * | 2014-07-29 | 2014-12-10 | 江西世纪长河新电源有限公司 | Self-discharge screening method of lithium ion batteries |
| CN104237799A (en) * | 2014-09-04 | 2014-12-24 | 中天储能科技有限公司 | Method for fast judging self-discharging ratio of lithium iron phosphate battery |
| CN104259114A (en) * | 2014-09-16 | 2015-01-07 | 双登集团股份有限公司 | Screening method of lithium ion batteries with high self-discharging capacities |
| CN104991197A (en) * | 2015-06-30 | 2015-10-21 | 桐乡市众胜能源科技有限公司 | Lithium iron phosphate lithium ion battery self-discharge test method |
| CN106908727A (en) * | 2015-12-22 | 2017-06-30 | 郑州比克电池有限公司 | The method for precisely detecting lithium ion battery self discharge |
| CN105710050B (en) * | 2016-03-11 | 2018-04-03 | 北京华特时代电动汽车技术有限公司 | Battery cell method for separating |
| CN105728351B (en) * | 2016-03-11 | 2018-03-30 | 北京华特时代电动汽车技术有限公司 | Battery cell method for separating |
| CN108287314A (en) * | 2017-12-30 | 2018-07-17 | 惠州亿纬锂能股份有限公司 | A kind of evaluation method of lithium ion battery self discharge |
| CN108160531B (en) * | 2018-03-15 | 2021-04-09 | 惠州亿纬锂能股份有限公司 | Battery self-discharge sorting method |
| CN109490792A (en) * | 2018-10-19 | 2019-03-19 | 合肥国轩高科动力能源有限公司 | A kind of fail battery selection method in the big mould group of lithium ion battery self discharge |
| CN111123117A (en) * | 2019-11-29 | 2020-05-08 | 合肥国轩高科动力能源有限公司 | Screening process for self-discharge of ternary lithium ion battery |
| CN111679208A (en) * | 2020-06-09 | 2020-09-18 | 捷威动力工业嘉兴有限公司 | Standing method for self-discharge detection of lithium ion battery |
| CN111679219B (en) * | 2020-06-10 | 2022-06-14 | 江苏开沃汽车有限公司 | Self-discharge screening method for lithium ion power battery |
| CN111760805A (en) * | 2020-06-18 | 2020-10-13 | 合肥国轩高科动力能源有限公司 | Lithium ion experimental battery testing and screening method |
| CN112462277B (en) * | 2020-11-13 | 2023-06-23 | 珠海冠宇电池股份有限公司 | Lithium ion battery self-discharge performance detection method |
| CN113325318B (en) * | 2021-04-30 | 2022-12-13 | 上海空间电源研究所 | Lithium ion storage battery consistency screening method |
| CN113466727A (en) * | 2021-07-07 | 2021-10-01 | 广州鹏辉能源科技股份有限公司 | Battery self-discharge screening method and device, terminal equipment and readable storage medium |
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| CN102117937A (en) * | 2011-01-12 | 2011-07-06 | 合肥国轩高科动力能源有限公司 | Self-discharge screening method for lithium ion phosphate battery |
| CN203025300U (en) * | 2013-01-08 | 2013-06-26 | 湖北宇隆新能源有限公司 | Clamp suitable for testing lithium ion batteries and cells |
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| CN102117937A (en) * | 2011-01-12 | 2011-07-06 | 合肥国轩高科动力能源有限公司 | Self-discharge screening method for lithium ion phosphate battery |
| CN203025300U (en) * | 2013-01-08 | 2013-06-26 | 湖北宇隆新能源有限公司 | Clamp suitable for testing lithium ion batteries and cells |
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